Concave for thrashing machines



Mar. 27, 1923 1,449,645 I A. ANDERSON CONCAVE FOR THRASHING MACHINES I Filed Apr. 10, 19,22] 1 2 sheets-sheet 1 Magi Wynn n I Mar. 27, 1923,

A. ANDERSON CONCAVE FOR THRASHING MACHINES Filed Apr. 10 1922. 2 sheets-shear 2 a 1 93 A Pi F a l 2 I]UUUUUUUUUUUUUUU 4 J f 2 /2 l :1 ag.

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PATENT @FFEQE.

AUGUST ANDERSON, OF ST. PAUL, MINNESOTA.

CONCAVE FOR THRASHING MACHINES.

Application filed. April 10, 1922. Serial No. 551,144.

To all whom it may concern:

Be it known that I, Aucusr ANnERsoN a citizen of the United States, residin at st. Paul, in the county of Ramsey and tate of Minnesota, have invented certain new and useful Improvements in Concaves for Thrashing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a thrashing machine and particularly to the mounting of the teeth in the cylinder concave usually employed in such machines. It is desirable to have the concave and the teeth thereof in different positions for operating on various kinds of grain. It also happens that the concave sometimes becomes clogged with grain or some foreign substance and it is desirable to have the teeth thereof yieldingly mounted so that the clogging can be relieved or the teeth moved to prevent breakage by some hard substance such as a stone.

It is an object of this invention therefore to provide'a concave having the teeth so mounted therein that the same can be readily adjusted and held in the desired position and also be yieldingly mounted.

It is a further object of the invention to arrange the teeth for such adjustable and yielding movements in groups.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings, in which like reference characters refer to the same parts throughout the different views, and in which, i

Fig. 1 is a View in side elevation of the front portion of a thrashing machine, in which the concave is mounted; a

Fig. 2 is a vertical section through the concave taken in a plane normal to the axisof the cylinder;

Fig. 3 is a view in front elevation of the portion of the machine shown in Fig. 1 some of the parts being shown in section;

Fig. 4 is a detailed vertical section of some of the parts; and

Fig. 5 is a partial plan view showing part of the concave.

Referring to the drawings:

The walls of the front portion of a thrashing machine are indicated as 1 to which are bolted the reversely formed plates 2, which plates are arcuate 'in shape and provided with an arcuate groove or slot 2, which slot 2 forming a cam surface with'which contacts a crank rod 3, the offset ends of which are journaled in the side members 1. One of these ends is provided with a ratchet lever 4 having notches therein co-operating with a pawl 5 pivoted to the member 1. It will thus be seen that by swinging the lever 4, the

plates 2 will be swung about their pivots at 2 and moved to or from the cylinder 6 shown in dotted lines in Fig. .2 and the plates can be held in their adjusted position by the pawl 5.

Mounted in the slots 2 and extending between the plates 2 are a plurality of frames 6, 7 and 8. The plate 8 is of the usual construction in such cylinder concaves having a plurality of parallel transverse slots therein and one or more rows of fixed teeth 8. The frames 6 and 7 are of open,rec-

tangular outline and have j ournaled therein slats or bars 9 having'project'ing pintle's which are journaled in the ends of the frames 6 and 7 These pintles, it will be noted in Figs. 2 and 4 are disposed adjacent one side of the slats and near the inner edge thereof. Each of the bars 9 has bolted thereto a row of teeth 10 of the usual shape and kind used in thrashing machine concaves. The said bars in the frame 7 are also provided at spaced points with outwardly projecting arms 9" the two bars in one of V the frames having the outer end of these arms connected by links 11. The outer end of each link has a projection thereon to which is pivoted a rod or link 12. These rods 12 extend forwardly and have forked ends which are in turn pivotally connected to arms 13, which are secured to and project from a shaft 14 journaled in a bearing 15," which is bolted to a crossfmember 16 extending'between the frame members 1 at the front thereof. The bars 9 pivoted in the frame 6 are likewise provided with-the proje ctions 9 connected by links 11 and links 1'? are connected to the latter links 11 and have their forked front ends pivotally connected to arms 18 secured to and projecting from a shaft 19 journaled in spaced bearings 20 bolted to the member 16. The shafts 14 and 19 are also'journaled in a double bear- Ill) ing 21 bolted to the end of one of the side members 1. A rack segment 22 is bolted to the end of the member 16 and a lever 23 has a hub portion journaled in the end or the shaft 14, said lever being provided with a; handle and the usual grip lever and pawl adapted to co-operate with the segment 22 Said lever also has a portion 2-5 projecting beyond its hub portion. An arm 24 is rigidly secured adjacent the end of shaft. 14 immediately outside the bearing 21 and has its end bent to lie in transversealinement with the end of arm 23, which latter arm is also bent inwardly or toward the side 1. These arms are apertured and a headed and nutted bolt extends through said apertures and is surrounded by a coiled compression spring 25. A lever 26 similar to the lever 23 having a handle portion equipped with a grip lever means for operating a pawl adapted to fit in the segment 22 has its hub portion journaled in the end of shaft 19. This lever has a projecting arm 26 on its hub portion extending inwardly to have its end alined with the outer end of arm 27 rigidly secured to the shaft 19 between lever 26 and bearing 21. The arms 26 and 27 are apertured at their outer ends through which passes a headed and nutted bolt surrounded by a coiled spring 28 disposed between said arms.

vVith the described structure, it will be seen that the concave can be bodily swung toward and from the cylinder Z) by manipulating the lever 4. By moving the lever 23, the bars 9 in the frame 7 will be swung about their pivots and the teeth 10 correspondingly moved. By manipulation of the lever 26, the teeth 10 on the bars 9 in the frame 6 can besimilarly moved. T he levers 23; and 26 are held in their adjusted positions by the segment 22 and the pawls engaging the teeth thereof. Various inclinations can be given to the teeth by movement of the levers 23 and 26 to suit grains of different kinds. It will be noted that each lever is independently connected to and independently operates one group of the toothed carrying bars. Should the cylinder and concave, tend to become clogged by grain or should some foreign substance pass between the same, the teeth can yield to relieve the clogging or permit the passage of such substance. The teeth will swing about the pivots of the bars 9 and move the links 12 or 17. thus oscillating the shafts 14 and 19. The arms 24 and 27 on the ends of these shafts will be turned and will move toward the arms 23 and 26 of the levers compressing the springs 25 and 28 therebetween. This yielding movement of the teeth can take place at any time in any adjusted position of the levers 23 or 26 and is independent thereof. When the teeth are adjusted by means of said levers, the shafts 14 and 19 are turned through the pressure of springs 25 and 28 by the arms 23 and 26 of the levers. By adjusting the nutsv on the bolts passing through the ends of the arms 23 and 26 and arms 24 and 27, the tension of springs 25 and 28 can be varied and the resistance of the teeth 10 to any turning movement will likewise be varied.

From the above description, it is seen that applicant has provided a simple and eilicient structure ot thrashing machine concave.

The teeth have independently adjustable yielding movements and can also be independently adjusted in position. The disposition of the pintles on the bars 9 is such that when the said bars are turned, the teeth thereon will not only be thrown or swung rearwardly but will be moved downwardly to, aconsiderable extent and will thus be brought to, a position nearly or quite out of the field of movement of the cylinder teeth. The teeth 10 and bars 9 can be swung in one direction until the teeth of one bar contact with the other bar and the teeth on the latter bar contact with the side, of the frame in which they are mounted. The swinging movement of the bars and teeth in the other direction is limited by the engagement of they levers 23, and 26 with the central part of the segment 22. The, present application is directed to the same subject matter broadly as. applicants previous application filed Oct. 20th, 1916, and allowed Oct. 13th, 1917, this, application however discloses specific differences over the matter dis closed in the former.

It will, of course, be understood that various changes may be made in the form, details and arrangement of the parts without departing from the scope of applicants invention, which generally stated consists in the matter shown and described and set forth in the appended claims.

lVhat is claimed is:

1. A. concave for thrashing machines, comprising a plurality of oscillatory toothed bars constructed and arranged to move in planes substantially at right angles to the axis of rotation of the thrashing cylinder, and independentlyadjustable spring tension devices for yieldingly holding said toothed bars in operative positions.

2. A concave for thrashing machines, com prising a plurality of removably mounted oscillatory toothed bars constructed and arranged to move in planes substantially at right angles to the axis of rotation of the thrashin cylinder and independently-adjustable spring tension devices for yield ingly holding the toothed bars in operative positions.

3. A concave for thrashing machines, comprising a plurality of oscillatory toothed bars connected in groups and for each group ed in the frames and movable about their longitudinal axes and yieldingly held with their teeth in operative position by means of independently adjustable spring tension devices.

6. A concave for thrashing machines, comprising a plurality of oscillatory toothed bars constructed and arranged to move in planes at right angles to the axis of rotation of the thrashing cylinder, independently adj ustable spring tension devices for yieldingly holding the toothed bars in operative positions and means for oscillating said bars and holding said bars in difierent positions.

7. A concave for thrashing machines, having in combination, a plurality of oscillatory toothed bars adapted to swing in planes at right angles to the axis of rotation of a thrashing cylinder, independently adjustable spring tension devices for groups of said bars and means for oscillating said bars and spring tension devices to different positions andfor holding the same in said position.

8. A thrashing machine concave having in combination a plurality of oscillatory toothed bars constructed and arranged to move in planes substantially at right angles to the axis of rotation of the thrashing cylinder, lever means for moving certain of said bars to different positions and holding the same in said position, and yielding adjustable tension devices between said bars and levers.

9. A concave for thrashing machines comative positions, said resilient means being unaffected by the movement imparted to the bars by the said oscillating means.

11. A concave for thrashing machines comprising, a plurality of oscillatory toothed bars, means for oscillating the bars, resilient means for yieldingly holding the bars in operative position, said holding means being unaffected by the movement imparted to the bars by said oscillating means, and means for varying the tension of said resilient means.

12. A concave for a thrashing machine having in combination, a frame, a plurality of oscillatory toothed bars in said frame, a shaft carried on said frame parallel to said bars and connected thereto to swing the same transversely, an arm secured to said shaft, a lever having an arm in alinement with said arm, resilient means .disposed between said arms, and means for holding said lever in various positions of adjustment whereby the bars can be adjusted through said resilient means and yieldingly held in adjusted positions.

13. A concave for thrashing machines having in combination, a plurality of oscillatory toothed bars adapted to swing in transverse planes at right angles to the axis of rotation of the thrashing cylinder, means connecting said bars in groups, a lever for each group, and connections from each lever to said group for oscillating said bars, said connection comprising a resilient element.

14. The structure set forth in claim 13, said resilient means being adjustable to yieldingly hold the bars of said group in position under various tensions.

In testimony whereof I affix my signature.

, AUGUST ANDERSON. 

